When I am trying to run my code, I am getting these errors: Error using size Too many input arguments. Error in cell/strcat (line 26) siz{i} = size(varargin{i}); Error in uiopen (line 63) allML(1)=s​trcat(allM​L(1), ';*.mdl;*.slx');

clc;clear all;close all;
size = 10;                      
maxIter = 100;                          
inertia = 1;
correction_factor = 2;
% set the position of the initial swarm
a = 1:10;
[X,Y] = meshgrid(a,a);
C = cat(2,X',Y');
D = reshape(C,[],2);
position.x(1:size,1) = D(:,1);                                                    
position.y(1:size,1) = D(:,2);                                                    
position.v.x(1:size,1) = 0;                                                      
position.v.y(1:size,1) = 0;                                                       
position.funbest(1:size,1) = 10000;                                               
position.pbest.x(1:size,1) = 0;                                                   
position.pbest.y(1:size,1) = 0;                                                   
plotObjFcn = 1;                                                                   
objfcn =  @(s)(s(:,1) - 30).^2 + (s(:,2) - 30).^2;
tic;
for iter = 1:maxIter
    position.x(1:size,1) = position.x(1:size,1) + position.v.x(1:size,1)/1.3;       
    position.y(1:size,1) = position.y(1:size,1) + position.v.y(1:size,1)/1.3;      
    x =  position.x(1:size,1);                                                    
    y =  position.y(1:size,1);                                                    
    fval = objfcn([x y]);                                                        
    for a = 1:size
        if fval(a,1) < position.funbest(a,1)
            position.pbest.x(a,1) = position.x(a, 1);                  
            position.pbest.y(a,1) = position.y(a, 1);                  
            position.funbest(a,1) = fval(a,1);                         
        end
    end
    [~, gbest] = min(position.funbest(:,1));                           
    position.v.x(:,1) = inertia*(rand(size,1).*position.v.x(:,1)) + correction_factor*(rand(size,1).*(position.pbest.x(:,1) ...
        - position.x(:,1))) + correction_factor*(rand(size,1).*(position.pbest.x(gbest,1) - position.x(:,1)));             
    position.v.y(:,1) = inertia*(rand(size,1).*position.v.y(:,1)) + correction_factor*(rand(size,1).*(position.pbest.x(:,1) ...
        - position.y(:,1))) + correction_factor*(rand(size,1).*(position.pbest.y(gbest,1) - position.y(:,1)));             
    clf;plot(position.x(:,1), position.y(:,1), 'kP');             
    axis([-2 100 -2 100]);
    pause(.1);                                                 
    disp(['iteration: ' num2str(iter)]);
end
toc;
hold on
figure(2);
if plotObjFcn
    ub = 60;
    lb = 0;
    npoints = 1000;
    x = (ub-lb) .* rand(npoints,2) + lb;
    for a = 1:npoints
        f = objfcn([x(a,1) x(a,2)]);
        plot3(x(a,1),x(a,2),f,'.r');hold on

      end
      plot3(position.pbest.x(1,1),position.pbest.y(1,1),position.funbest(1,1),'xb','linewidth',5,'Markersize',5);grid

end

[Stephen23]

You don't use any of the functions shown in error message. Please add a comment here showing us the complete error message: this means all of the red text.

Answer 1

[Arnab Sen]

Hi vineeth ,

You are getting this error due the variable 'size' that you define in the second line of the code by using the statement:

>>size=10

As a result the variable 'size' shadows the MATLAB inbuilt function 'size'. That is, as soon as the 'size' variable comes into the workspace any consecutive reference to 'size' would refer to the variable and not the MATLAB function. So, the following statement in cell/strcat (line 26)

>> siz{i} = size(varargin{i});

Here, the issue is the 'size' is treated as a variable and not as a function and MATLAB throws the error. To avoid it give the variable as different name other than 'size'.

You can verify using this by the following command :

>>which -all size